Reenforcement for moving-picture films



May 13, 1924.. 1,493,924

J. J. DILKS REENFORCEMENT FORMOVING PICTURE FILMS Filed March 20. 1923 l 5', -J` 6 J 6 l "L. i 4 4 4 i 4 i 4; 4 4 4 4 --1'3 Z E@ l ,J Y J J1 5' l l l J4-J4J4-J-4J4 JAMES J. DLKS,

Patented May 13, 1924.

.TAKES ."r. ninas, or PHILADELPHIA., PENNSYLVANIA.

REENFOCEMENTIOR MOVING-PICTURE FILMS.

Application led March 20, 1923.

To all whom t may concern.'

Be it known that I, JAMES J. Duns, a citizen of-the United States, residing at Philadelphia, county of Philadelphia, State of Pennsylvania, have invented a new and useful Reenforcement for Moving-Picture' Films, of which the following is a specification.

My present invention relates to a reinforcing strip to motion picture films and consists of a novel reinforcing device which can be expeditiously and effectively applied to the apertured edgesof films of the character referred to."

It further consists of a novel reinforced erforated film to lbe hereinafter referred to aving the reinforcing strip applied to the perforated zone, said strip having means which pass through perforations in the film but which are free from contact with the edges of said perforations, in combination with means for longitudinally reinforcing said film. i

It further consists Vof other novel features of construction and advantage all as will be hereinafter fully set forth.

For the purpose of illustrating my invention, Iy have shown in 'the' accompanying drawing an embodiment thereof whlch is at present referred by me, since this embodiment wi l be found in practice to give satisfactory and reliable results. It is, however, to be understood that the various instrumentalities of which my invention consists can be variously arranged and organized and that my invention is not limited to the precise arrangement and organization of these instrumentalities as herein shown and described.

The object of my invention is to provide an effective reenforcement for the perforations and edges of motion picture film, an object which I attain in the manner hereinafter set forth, reference being had to the accompanying drawing, in which- Fig. 1 1s a face view of a sectlon of motion picture film having its perforations and edges reinforced in a manner in accordance with my invention,

Fig. 2 is a transverse sectional view, on a 'larger scale, on the line 2-2, Fig. 1, and

Fig. 3 isa longitudinal sectional view, on the same scale as Fig. 2, on the line 3-3, Fig. 1.

Referring to the drawing, there is illustrated a strip .1 of fihn provided, adjacent Serial No. 626,292.

eachv edge, with the customary longitudinal row of perforations 4 for engagement with the toothed feed-wheels of camera or projector. The Yfilm is of such a delicate nature that it is desirable to reinforce it in the regions of the (perforations in order that it may more rea ily withstand the strains and stresses to which it is subjected, and this I accomplish by applying to the face of the film, in ali nment with each longitudinal row of per orations 4, a longitudinal strip of suitable fiexible material 5, adapted to cover the zone of. perforation and provided, coincidently with each perforation 4, with a pair of Wings 6 which project through the perforation and are oppositely bent back and clamped against the opposite face of the film, as is best shown in Fig. 3. lVith this construction, when `the film is fed through camera or projector, the toothed feed-wheels engage with the wings 6 of the reinforcing strip 5 and do not come into contact with the edges of the perforations in the film. To render the rcenforcement of especial value, the wings 6, in their passage through a perforation 4, are provided withL a central alignment in'respect thereto as a result. of which they are free from contact with the edges thereof, as is also best shown in Fig. 3. By this means, the entire grip of the reinforcing strip 5 is upon the upper and under faces of the film and, at no time, is any strain placed upon the edges of the perforations 4.

In order to reinforce the edges of the strip of film 1, each reinforcing strip 5 is of such width that its outer edge may be turned down over the outer edge of the film and bent back against the o positc face thereof, so as to form a lip 7, w iich terminates at a point between the sprocket holes and the longitudinal edges of the film whereby the bottom s ace 8 of the'film betweenthe ed e of said lip 7, and the line of sprocket ho es is not covered with metal, so that its resiliency is unimpaired. This construction, which is best shown in Fig. 2, effectively eliminates any tendency which the film may possess to lcrack or split inwardly from its ed es, and

it will be further apparent that since the lip 7 is in close frictlonal contact onl with the underside .of the film, a more e ective reenforcement is provided than in prior devices where the entire bottom reenforcements extend from the longitudinal edges clear to or across the sprocket holes and are .equally` simple, are obvious, and re'quire'no especial illustratiomit being understood that I do vnot limitvmyselfto the exact construction shown in the drawing; ki l t It will nowbe` apparent thatI have devised a novel anduseful l'eenforcement forl moving picture films which yembodies the featuresvof advantage venumerated as des1r able 1n the; statement of theinvention and the above description, and WhileI'have, inv

the ypresent instance, shown and described a preferred embodiment thereof which will give in practice satisfactory and reliable results, itis to be understood thatthe same is "susceptible of modification in various particulars Without departing from thespirit or scope ofthe invention or sacrificing any of its advantages.- y

Iclaim: f

1. The combinationwvith a film vhaving sprocket holes along its opposite side edge port-ions, of longitudinally extending perforated reinforcing strips' arranged along the oppositeside edges of said film-and having holes aligning with said sprocket holes,

and integral clinching devices onsaid strips Afor securing the latter with respect to the walls of said sprocket holes, the outer edges of said reinforcing strips being extended *i Witnesses:

around the contiguous outeredge of the film and` being' bent under `the 1 latter and in frictional contact therewith tov forniv longitudinally extending lipsto protect the side edges of said film, the edges gof the underfolded lip' portions offsaid reinforcing strips terminatin'g betweenthe sprocket holes and the longitudinal edges of said film.- 2. The combination with a-filmv strip having sprocket holes-along its opposite Vside edge. portions, of"longitudinal1y extending perforated reinforcing strips arrimgedv along the Aopposite sideedge portions and having holes aligning with said sprocket holes, each yof said reinforcing strips having -a pair of integral WingsA adjacent to each'of -it-sholes and passing through the hole of the film strip with Which'the hole ofthe reinforcing strip aligns, said wings extending transverselyof the film strip and clinched on thel opposite side surface'of the film, the outer edge of each of said ieinforcing strips exnoA tending around the contiguous outer edge of the film strip andbeing bent under the latter to form longitudinally `extending lips' to protectf a sidev edge ofthe film strip and prevent said wings from shifting transverselyin one direction and tearing the film strip; the edgesof the underfolded lip portions ofsaid reinforcing v,strips terminating between` thc sprocket holes and the longitudinal edges of thegfilm, and bein'in lfrictional engagement with said longitu inal edges.

JAMES J. DiLKs.

EMILY I. VooDEs, N. BUssINoER. 

